Spring structure.



I. KARPEN.

SPRING STRUCTURE.

APPLICATION FILED AUG-6, 191.6.

Patented May 15, 1917.

2 SHEETS-SHEET I.

. KARPEN'.

SPRING STRUCTURE.

APPLICATION FILED AUG-6,1915.

2 SHEETS-SHEET 2.

Patented May 15, 1917.

of elongated flexible envelops, each contain- 2. In a spring structureof the character set forth, the combination of a plurality of flexibleenvelops, each comprising a series of isolated cells, a plurality offlexible envelops extending through slits in said firstnamed envelopsbetween the cells thereof, each of said second-named envelops comprisinga series of isolated cells, and coil springs confined in said cells.

3. In a spring structure of the character set forth, the combination ofa plurality of flexible envelope divided into cells by double rows ofstitches. and having slits betweenthe rows of stiches, springs confinedin said cells, a plurality of flexible envelops extending through saidslits, and springs confined in said second-named envelops and disposedin spaces between said first-named envelops.

4. In a spring structure of the character set forth, the combination ofa plurality of flexible envelops divided into cells by double rows ofstitches and having slits between the rows of'stitches, springs confinedin said cells, a plurality of flexible envelops extending through saidslits and each divided into a plurality, of cells by stitchesi andsprings confined in said last name v named cells.

6. In a spring structure, an elongated flexible envelop divided into.cells and provided with slits between the cells adapted to permit asimilar envelop to extend therethrough, and. springs confined in saidcells.

ISAAC KARPEN. In presence of- D. G. THORSEN, 0. C. Avisos.

